System Faults Testability Based on Observabal Concept
基于可观概念的系统故障可测性研究

How to determine the best test-points in faults diagnosis of dynamical systems is a very important problem and it is the main content of testability design. This paper solves this problem by showing that the poorest testability is in the direction of eigenvector associated with the smallest eigenvalue of observability matrix. Added new tests in this direction are shown to improve the testability, and the best possible testability is that all eigenvalues are equal. An example is given to illustrate how to select the test-points in faults diagnosis of analog circuits.